from what i found about md raid1 support in google:

http://lkml.indiana.edu/hypermail/linux/kernel/1203.1/01772.html
[patch 4/7] md: raid 1 supports TRIM
From: Shaohua Li
Date: Sun Mar 11 2012 - 23:14:04 EST

from ext4:
https://ext4.wiki.kernel.org/index.php/Ext4_Howto#Ext4_code_implements_discard.2FTRIM
https://sites.google.com/site/lightrush/random-1/howtoconfigureext4toenabletrimforssdsonubuntu
http://forums.gentoo.org/viewtopic-p-6187612.html


2013/9/13 Roberto Spadim [off-list ref]:

trim is enabled at mount option of filesystem (mount -t ext4 /dev/md0
/home -o discard)
for ext4 it's discard option if i'm not wrong
last kernels have trim support in software raid-1 (md raid1 driver),
just mount the filesystem over it and use, i don't know the exact
kernel version but it's ~1 year old feature

2013/9/13 Derek Piper [off-list ref]:

quoted

Hi,

Having found a posting on this list from July this year, I am trying to
find if (and how) TRIM support is supported and enabled under RAID 1 with 2
SSD drives.

The posting was mentioned that it was included in the kernel source as of
October 11th 2012.

I see nothing on the RAID wiki for enabling TRIM for SSD backed arrays. Any
pointers?

I have a system with Debian 7 (Kernel 3.2, mdadm 3.2.5) that I am working
on.

Thanks in advance,

Derek

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